#3 Luis Suarez
Luis Suarez has arguably been the standout striker in the world over the last decade, with his penchant for goals and high work rate earning him plenty plaudits.
Despite his extremely controversial history, Luis Suarez has been one of the most consistent goalscorers in history and is the only man in history to have won Golden Boots in the Eredivisie, Premier League and La Liga. He is also one of the highest scoring active players.
However, for all his scoring prowess, Uruguay's all-time record goalscorer has found it difficult to get going on the continent in recent seasons.
He is yet to find the back of the net in six Champions League fixtures this season, while he has scored just four in his last 25 UCL matches.
Incredibly, Luis Suarez has gone a massive 1,294 days without an away Champions League goal - a run which stretches back 17 games to a clash with AS Roma in September 2015.
If Barcelona are to progress, they would need Suarez to rediscover his scoring touch in the competition. Without this, Barcelona could once again fail in their quest to get their hands on the big one.